I was testing new equipment (Riccardi reducer) tonight. Normally, sitting on top of a 6-storey building in downtown Frankfurt that during the night dissolves the remaining heat of a hot summer day, resulting in lots of turbulence and horrible seeing, is not exactly a good idea when taking astro images. However, for test work it was good enough. I found the Riccardi was doing very well, so the distance between corrector and cmos must have been about right.Image processing was quick and dirty. Stacking in Regim, S-curve in Gimp, and a tiny amount of sharpening. No masks or other tricks, so stars are a bit inflated.
TS107/700 reduced to f=525mm, f/4,9 on Losmandy G-11
Guiding ASI 294/Celestron 102/1000
62x2min ASI 294Pro, Gain 120, -10°C No optical filter.